PV Systems: grounded / ungrounded / functionally grounded
In the past, inverters were commonly referred to as “grounded” because one of the DC current-carrying conductors was physically connected […]
Oregon LRT
Oregon LRT
The Limited Renewable Energy Technician (LRT) license in Oregon is designed for individuals specializing in renewable energy systems such as solar electric, wind turbines, micro-hydro, and fuel cells, typically up to 50 kW. This license allows technicians to install, maintain, and finish renewable energy systems under specific conditions. The LRT license is primarily focused on the DC side of these systems, although recent legislative changes have expanded the scope of work to include certain AC installations and connections.
Oregon LRT
NEC 250, NEC 690 part 5
Grounding: connected to earth Bonding: things are connected together (doesn’t imply connection to earth) Article 250 – 10 parts; must
Oregon LRT
Maximum Heights
There are a few instances where maximum height rules comes into play when installing solar in Oregon. Disconnect Switch
Oregon LRT
UL 3141 standard
Currently as of April 2024 there is no formal UL listing for PCS, only a limited “certification requirement decision” but
Oregon LRT
Article 240 Overcurrent Protection
The requirements and purpose of overcurrent protection devices (OCPDs) for electrical circuits up to 1,000 volts, nominal. Here’s a breakdown
Oregon LRT
705.12(B)(3)(6): panelboards supplying feed-through conductors
size feed-through conductors as feeders per 705.12(B)(1) There are 2 choices:
Oregon LRT
Sizing PV source circuit conductors with all NEC correction factors
For determining how big the wire needs to be in order to carry the current in the circuit safely we
Oregon LRT
STC 1,000 W/m^2
Weather conditions can exceed STC rating of 1000 Watts per meter squared. For example, on a clear day with snow
Oregon LRT
Limited renewable energy technician(LRT) OAR 918-282-0205
Make renewable energy system installations. (Must be employed by a limited renewable energy contractor orelectrical contractor.)